The study that I remember off the top of my head is the one that came out of UC Berkeley. News article: https://news.berkeley.edu/2015/05/29/motorcycle-lanespli

The study that I remember off the top of my head is the one that came out of UC Berkeley. News article: https://news.berkeley.edu/2015/05/29/motorcycle-lanesplitting-report/ https://news.berkeley.edu/2015/05/29/motorcycle-lanesplittin... There's been a couple of others that I remember seeing, but I don't remember them or which sources I saw them at.